1. A phosphate group: This is a negatively charged molecule that consists of a phosphorus atom bonded to four oxygen atoms.

2. A ribose sugar: This is a five-carbon sugar that gives RNA its name (ribonucleic acid).

3. A nitrogenous base: There are four different nitrogenous bases found in RNA: adenine (A), guanine (G), cytosine (C), and uracil (U). These bases are responsible for carrying the genetic information within RNA.

These three components are linked together to form a single RNA nucleotide. Many nucleotides are then linked together to form a long chain, which constitutes a molecule of RNA.